LTC2411-1IMS#TRPBF【PDF 28/40 页】IC A/DCONV DIFF INPUT&REF 10MSOP

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LTC2411/LTC2411-1

APPLICATIO S I FOR ATIO

the sensor largely eliminates the need for protection

devices, RFI suppression and wiring. The LTC2411/

LTC2411-1 exhibit extremely low temperature dependent

drift. As a result, exposure to external ambient tempera-

ture ranges does not compromise performance. The in-

corporation of any amplification considerably complicates

thermal stability, as input offset voltages and currents,

temperature coefficient of gain settling resistors all be-

come factors.

The circuit in Figure 41 shows an example of a simple

amplification scheme. This example produces a differen-

tial output with a common mode voltage of 2.5V, as

determined by the bridge. The use of a true three amplifier

instrumentation amplifier is not necessary, as the LTC2411/

LTC2411-1 have common mode rejection far beyond that

of most amplifiers. The LTC1051 is a dual autozero ampli-

fier that can be used to produce a gain of 30 before its input

referred noise dominates the LTC2411/LTC2411-1 noise.

This example shows a gain of 34, that is determined by a

feedback network built using a resistor array containing

eight individual resistors. The resistors are organized to

optimize temperature tracking in the presence of thermal

gradients. The second LTC1051 buffers the low noise

1Input referred noise for AV = 34 is approximately 0.05VRMS, whereas at a gain of 50, it would be

0.048

VRMS.

Figure 41. Using Autozero Amplifiers to Reduce Input Referred Noise

input stage from the transient load steps produced during

conversion.

The gain stability and accuracy of this approach is very

good, due to a statistical improvement in resistor match-

ing due to individual error contribution being reduced. A

gain of 34 may seem low, when compared to common

practice in earlier generations of load-cell interfaces, how-

ever the accuracy of the LTC2411/LTC2411-1 changes the

rationale. Achieving high gain accuracy and linearity at

higher gains may prove difficult, while providing little

benefit in terms of noise reduction.

At a gain of 100, the gain error that could result from

typical open-loop gain of 160dB is –1ppm, however,

worst-case is at the minimum gain of 116dB, giving a gain

error of –158ppm. Worst-case gain error at a gain of 34,

is –54ppm. The use of the LTC1051A reduces the worst-

case gain error to –33ppm. The advantage of gain higher

than 34, then becomes dubious, as the input referred

noise sees little improvement1 and gain accuracy is poten-

tially compromised.

0.1

REF+

REF–

SDO

SCK

IN+

IN–

GND

VCC

5VREF

350

BRIDGE

2411 F41

RN1 = 5k

× 8 RESISTOR ARRAY

U1A, U1B, U2A, U2B = 1/2 LTC1051

–

U1A

–

RN1

611

710

512

U1B

–

U2A

–

U2B

LTC2411/

LTC2411-1

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